Tone-arm mounting for talking-machines.



F. C. HINCKLEY & L. G. LARSEN.

TONE ARM MOUNTING FOR TALKING MACHINES.

APPUCATION FILED JULY 31, 1915.

135,627 Patented Nov. 21,1916.

UNITED STATES PA FRANK C. HINCKLEY AND LOUIS G. iJARSEN, OF BRIDGEPORT, CONNECTICUT, ASSIGN- OBS TO AMERICAN GRAPI-I OPHONE COMPANY, OF BRIDGEPORT, CONNECTICUT, A

CORPORATION OF WEST VIRGINIA.

TONE- ARM MOUNTING FOR TALKIN G-MACHIN ES.

To all whom '2'! may concern:

Be it known that we, FRANK C. HINCKLEY and LOTTJH (1'. LARSEN', citlzens of the United States of America, and residents of Bridge- The invention is particularly adapted for use in connection with a small sized talking-machine for use with little disk soundrecords of the Little wonder type.

The invention will be better understood by reference to the accompanying drawing, illustrating one expression of the inventive idea, and wherein Figure 1 is a plan view of a talking-machine equipped with the invention; Fig. 2

is a vertical'section, partly in elevation, showing the tone-arm mounting, the section being on the line 22 of Fig. 3; Fig. 3 is a transverse vertical section on the line 33 of Fig. 2; and Fig. l is an enlarged detail.

Referring to the drawings, wherein like reference numerals indicate like parts, 10

,is. a talking-machine casing on which is rotatably mounted in any suitable manner a sound-record 11, here shown as, being of the disk type. A sound-box 12 mounted'on one end of a tone-arm 13 is adapted to be propelled across the record in the usual manner. The other end of the tone-arm 13 projects into a support, here shown as a sta- "tionary hollow member 14 which is secured to the top 15 of the talking-machine casing 10 in any suitable manner, as by screws 16 passing through a flange 17. The lower end ofthe member 14 connects with an amplifier 9 in the casing 10.

The end of the tone-arm that projects into the hollow member 14 is bulged or made spherical in form, as clearly indicated at 18 in Fig. 2, and this curved portion has a pinand-slot connection with its support. As

Specification of Letters Patent.

Application filed July 31, 1915.

Patented Nov. 21, 1916.

Serial No. 43,009.

here shown, the spherical portion is provided at diametrically opposite points with slits or openings 1919, in which openings project the inner ends of pins 2020 which are carried by the upper end of the hollow member 14. As av preferred construction, the upper end of hollow ,,1neinber 14 is provided with an annular flange 22, preferably integral therewith, which flange carries the pins 20 and 20 in screw-threaded engage ment therewith. It will be understood, however, that by the term flange any annular extension or projection is meant.

Interposed between flange 22 and the curved or spherical surface 18v is. a washer 23 of felt, or other suitable material, this washer acting, among other things, to form a sound-tight joint between the tone-arm and its support. An annular member '24 is carried by flange 22 and is provided with an inwardly extending flange 25 which closely approaches the curved surface 18. Perfor'ations or openings in said annular member 24: accommodate the heads of pins 20 and 20, which hold said member in place on the flange 22, as clearly shown in Fig. 4. The opening in the inwardly extending flange 25 is elliptical rather than circular in shape, its longer axis being horizontal, as shown in Fig- 3. This form of opening is provided to enable the tone-arm to have a suflicient lateral traverse.

A pin 26 is mounted in the bulged or spherical portion 18 of the tone-arm 13, and this pin is preferably provided with a curved part 27, to which part is secured one end of the spring 28, the other end of which secured to the support or hollow member 14, as by a. rivet 29. This spring maintains the tone-arm 13 continually under the clesired'tension, and under normal conditions, when the stylus is in engagement with the record, said spring holds the tone-arm with one of the pins 20 and 20 against the front end of the corresponding one of the slots that the invention is not limited to the struc ture shown, but that the inventive idea is susceptible of various mechanical expres sions within the limits of the appended claims.

of a casing, an amplifier, a hollow stationary elbow mounted on said casing and com municating at its lower end with said amplifier, a tone-arm provided with a bulged or spherical portion surrounded by the upper horizontal end of said elbow, and opposed vertical pivot pins carried by said upper end of said elbow and engaging in opposed slots in said spherical portion.

3. In a talking machine, the combination of a casing, an amplifier, a hollow stationary elbow mounted on said casing and coin municating at its lower' end with said am plifier, a tone-arm provided with a bulged or spherical portion surrounded by the upper horizontal end of said elbow, opposed vertical pivot pins carried by one of said last two, members and engaging opposed slots in the other of said members, and a springreacting betweensaid spherical. portion and said elbow.

at. In a talking-machine, the combination of a casing, an amplifier, a hollow stationary member mounted on said casing and communicating at its lower end with said amplifier, a tone-arm provided with a-bulged or spherical portion surrounded by the upper end of said stationary member, a felt washer interposed between said upper end of said stationary member and said spheri cal portion, and opposed pivot pins carried by said upper end of said stationary memher and engaging in opposed slots in said spherical portion.

5. In-a talking machine, a hollow station-' ary member, a tone-arm provided with a bulged or spherical portion surrounded by one end of said stationary member, a felt washer interposed between said end of the stationary member and said spherical portion, and an annular member carried by said end of the stationary member and having an inwardly extending flange provided with an elliptical opening.

6. In a talking machine, a hollow stationary member, a tone-arm provided with a bulged .or spherical portion surrounded by one end of said stationary member, a felt washer interposed between said end of the stationary member and said spherical portion, pivot means operatiwly connecting said end of the stationary member and said tone-arm, and an annular member carried by said end of the stationary member and having an inwardlyextending flange provided with an elliptical opening.

7. In a talking-machine, the combination of a casing, an amplifier, a hollow stationary member mounted on said casing and communicating at its lower endwith said amplifier and provided with a flange at its upper end, a tone-armprovided with a bulged or spherical portion surrounded by said flange, a felt washer interposed between said fiange andspherical portion, means limiting the vertical movement of said tone-arm, and an annular member carried by said flange and having an inwardly'extending flange provided. with an elliptical opening.

8. In a talking-machine, a tone-arm provided at one end with a spherical portion having opposed slots, a supportfor said tone-arm in which said spherical portion projects, a washer interposed between said support and spherical portion, and means projecting through said washer and engaging in said opposed slots, said'last-named means limiting the vertical movement of the tone-arm.

9. In a talking-machine, a tone-arm pro vided at one end with a spherical. portion having opposed slots, a support for said tone-arm in which said spherical portion projects, a washer interposed between said support and spherical portion, means projecting through said washer and engaging in saidopposed slots, said last-named means limiting the vertical movement of the tonearm, and a spring reacting between said spherical portion and said support.

10. In a talking-machine, a tone-arm provided with a spherical portion, a support in which said spherical portion projects, means for limiting the vertical movement of said tone-arm, and an annular member carried by said support and surrounding said spherical portion and provided with an elliptical opening, the longer axis of which is horizontal.

11. In a talking-machine, a tone-arm pro-- nicating at its lower end with said amplifier, a tone-arm provided with a bulged or spherical portion extending within said hollow member, a felt washer interposed between said hollow member and spherical portion, and an annular member carried by said hollow member and having an inwardly extending flange provided with an elliptical opening.

18. 'In a talln'ng machine, a hollow suppor't having a horizontal open end, a tonearm-having a spherical portion projecting within the said open end of said support, one of said members having opposed slots, vertical pivot means carried by the other of said members and engaging in said slots, and a spring reacting between said spherical portion and said support.

'arn1 having a spherical portion projecting within the said open end of said support,

. said spherical portion having opposed slots,

opposed vertical pivot pins carried by said support and engaging in said slots, and a spring reacting between saidspherical portion and said support. I

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

FRANK o. HINGKLEY. LOUIS G LAB-SEN.

l/Vitnesses:

JOHN GRAHAM, Jr., C. lV. A nELAW. 

